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z in (-oo:+oo)
2/3 = z/5 // - z/5
2/3-(z/5) = 0
2/3-1/5*z = 0 // - 2/3
-1/5*z = -2/3 // : -1/5
z = -2/3/(-1/5)
z = 10/3
z = 10/3
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